What is the difference between Pind Daan and Shradh at Gaya?

Shradh is the broader term for the complete set of ancestral rites — it includes Tarpan (water libations), Pind Daan (rice-ball offerings), and Brahmin Bhoj (feeding of priests). Pind Daan specifically refers to the ritual of offering the consecrated rice balls. In common usage, both terms are often used interchangeably, but technically Pind Daan is one component within the larger Shradh ceremony. At Gaya, a complete Shradh necessarily includes Pind Daan as its central act.